Mo Dao Zu Shi (TV Series)

As the grand-master who founded the Demonic Sect, Wei Wuxian roamed the world, hated by millions for the chaos he created. In the end, he was back-stabbed by his dearest shidi and killed by powerful clans that combined to overpower him. He incarnates into the body of a lunatic who was abandoned by his clan and is later, unwillingly, taken away by a famous cultivator among the clans-Lan Wangji, his archenemy.